The fitter might be good, but if they are not very knowledgeable about the car then it dosen't help. As the bit about the damage to the window rubbers, they managed to damage mine slightly taking the old windscreen out. So i had to explain the damage wasn't there before the windscreen had been replaced, and had to show them some pics of the car before, and explain that i enter the car for S&S comps so i know it was spot on before. They did replace at the end but it's hassele you can do with out.